Converting Text To DOM Object

I have an XML file hosted by my ISP free web space. It naively treats
the file as text/plain. I would like to convert this data into a DOM
object. So far my googling has turned up nothing, although looking over
the DOM manual on Mozilla I came up with:

function convertDOM(text)
{
var lines = text.split("
");
var dom = document.createDocumentFragment();
for (var i = 0; i < lines.length; i++)
{
var node = document.createTextNode(lines[i]);
dom.appendChild(node);
}
return dom;
}

The returned object is not treated as an DOM object.
Anything I am missing / A different approach maybe?